She was introduced in the Sailor Moon S season of the anime and Infinity arc of the manga, and the corresponding season of Crystal. Sailor Neptune fought alongside her partner and loverSailor Uranus in defending the Solar System from outside threats. In both versions of the story, she was elegant, sophisticated, capable of sharp anger, and sometimes cold, whether she was in civilian or Senshi form. She was fully dedicated to her duty as a Senshi. Her powers were based on the sea or ocean (not just water in general like Sailor Mercury).

Sailor Neptune referred to herself as the "Soldier of Deep Waters" (深海の戦士) and the "Soldier of Embrace" (抱擁の戦士), under the guardianship of the "Sea Planet," referring to the literal meaning of the Japanese name for Neptune.

Costume

Sailor Neptune's (S) dominant color was sea-green (tiara gem, choker, collar, gloves, skirt, and heels) and her accent color was navy blue (bows). Her earrings were white studs, her collar had no stripes, and her choker had a sea-green gem with gold accents attached to it. Her shoulder pads were the same as the others. Her gloves were wrist-length (rather than elbow length). Her heels had criss-crossing straps up the ankles, like ballet slippers.

After the "Super" upgrade (Stars), her earrings remained the same, her choker had a star attached to it, her collar had one white stripe, the center of her front bow was a heart, she had one translucent shoulder pad, and the back waist bow was enlarged and lengthened. The length of her gloves remained the same.

Manga

Powers

Transformations

Neptune Planet Power, Make Up - Used this phrase to transform into Sailor Neptune.

Costume

After the "Super" upgrade, her costume was almost identical to the anime version, but the length of her gloves extended to her elbows, and the star on her choker had a sea-green gemstone in the center.

After the last upgrade in the Stars arc, her choker was V-shaped and the center of her front bow was a green five-pointed star. She had round light green puffed sleeves with two strips of darker fabric attached to the bottom. Her gloves became longer, reaching to her upper arms. In artbook illustrations, she had sea-green V-shaped wristbands with golden five-pointed stars on them, but they were not present in the manga. Her belt consisted of two ribbons, one sea green and one light green, with two long, thin back ribbons, clipped together by a golden five-pointed star. Her back bow was light green. Her skirt became two-layered, the top layer being sea-green and the bottom a lighter green. Her boots were knee-high and white, and each had a sea-green V-shaped border with a golden five-pointed star at the top. Her tiara gem was a sea-green five-pointed star and her earrings were sea-green, dangling five-pointed stars.

Crystal

Powers

Transformations

Neptune Planet Power, Make Up - Used this phrase to transform into Sailor Neptune.

Attacks

Deep Submerge - Sailor Neptune sent an energy blast at the enemy.

Submarine Reflection - Sailor Neptune used the Deep Aqua Mirror to send a blast of water at the enemy.

Costume

Sailor Neptune's sailor fuku in the musicals was faithful to her costume in the third season of the anime. Her collar, choker, shoes, sleeves, glove fittings, and the top layer of her skirt were green, and her bows and the bottom layer of her skirt were blue. Her sleeves were decorated with dark green beads. The ornament in the center of her front bow was a sea-green cross, in the center of which was a golden circle decorated with a ring of green gems. Her choker ornament was a golden cross with a green gem in the center, and she wore golden cross earrings. The trim on her costume and the stripes on her collar were all gold.

Video Games

Powers

In the video games in which she appeared, Sailor Neptune used the powers standard to her appearances in other versions of canon, but the following are powers unique only to the video games.

Since it is not known how long Sailor Neptune was active as a Sailor Senshi before she appeared in the series, some fans have theorized that she could have been an active Senshi even before Sailor V or Sailor Moon.